786. Letter Scale? 788. Watch repair tool - closes watches or sets lens. OR a nutcracker? 791. Cheese core sampler?
10/05/2006 7:54 AM
Anonymous said...
786. "O" ring guage?
10/05/2006 8:09 AM
Anonymous said...
791. Incurment Borer.
10/05/2006 11:32 AM
Anonymous said...
791- tree ring borer
10/05/2006 12:27 PM
Anonymous said...
792. I have one of these on my desk at work, I have used it on a few occasions for various purposes. I am in the electronics field. But I can't say exactly what it was meant for.
10/05/2006 2:43 PM
Anonymous said...
792 - Lab jack, used primarily in chemistry labs, but is also used in other science labs. It is designed to raise an item to a proper level, not to support a heavy item.
10/05/2006 5:43 PM
Anonymous said...
787 A Stillman's Pattern lever saw set
10/05/2006 6:10 PM
Anonymous said...
789. Because the ball is sat on the two ridges: That is, because the two ridges are off center to the ball, if in theory, the can sit on one ridge which is off center, it would spin the ball as it fell, but because it sits on two, gravity tries to spin it in opposite directions, thus slowing it down. Also if the ridges were flexible, the ball would 'dig' itself between them!!
789. The gold ball must be made of a softer material than the steel ball bearing, and offer surface resistance to the ramp edges that the steel doesn't.
10/06/2006 10:37 AM
Anonymous said...
789. If the ball were really a sphere containing another weighted ball in some kind of thick oil, the friction between the weighted ball, which would resist rolling, and the outer sphere, would cause the object to roll very slowly.
>788. Watch repair tool - closes watches or sets lens. OR a nutcracker?
Nutcracker is right
>791. Cheese core sampler?
Nope
>786. "O" ring guage?
See above
>791. Incurment Borer.
>791- tree ring borer
Yes
>792 - Lab jack...
>787 A Stillman's Pattern lever saw set
Both correct
>789. Because the ball is sat on the two ridges...
>789. The gold ball must be made of a softer material...
Neither of these.
>789. If the ball were really a sphere containing another weighted ball in some kind of thick oil, the friction between the weighted ball, which would resist rolling, and the outer sphere, would cause the object to roll very slowly.
This is correct, it's a Snail Ball. Please see the answer page for more info.
10/06/2006 1:03 PM
wallerby said...
789. Easy! The ramp has two high ridges of hard metal spaced at just slightly less than the diameter of the ball. As the ball rolls, it spins much faster than the actual distance it travels would indicate. It reaches a terminal rotation speed and thus will not travel down the ramp except at a snail's pace even though it is spinning like crazy! Try this where at the bottom of the ramp the ball comes into contact with a surface directly below it. The rotational velocity of the ball will cause it to shoot forward at an unexpected higher speed.
1/24/2011 5:29 PM
786. 2-7/8" tall [Image]
The top part can be unscrewed: [Image]
[Image]
787. 8" long [Image]
[Image]
788. 5" tall [Image]
[Image]
The center of the base is slightly concave. [Image]
789. A regular ball bearing can roll down a 7" long, 5 degree incline in about a second; the ball in the photo below takes a full 50 seconds to roll down the same ramp. The puzzle here is to explain why this ball rolls so slowly. 7/8" diameter: [Image]
790. 5" long, thanks to Dan for submitting this tool: [Image]
[Image]
791. The two smaller pieces can be stored in the 8" long handle when not in use, thanks to Gary for these photos: [Image]
[Image]
792. 1-3/8" to 5" tall, this jack could be used for many different purposes, but it was marketed for one specific type of work. The idea for this one is to determine what profession or activity it was made for. The platform is 3" square. [Image]
"Set 135"
12 Comments -
786. Letter Scale?
788. Watch repair tool - closes watches or sets lens. OR a nutcracker?
791. Cheese core sampler?
10/05/2006 7:54 AM
786. "O" ring guage?
10/05/2006 8:09 AM
791. Incurment Borer.
10/05/2006 11:32 AM
791- tree ring borer
10/05/2006 12:27 PM
792. I have one of these on my desk at work, I have used it on a few occasions for various purposes. I am in the electronics field. But I can't say exactly what it was meant for.
10/05/2006 2:43 PM
792 - Lab jack, used primarily in chemistry labs, but is also used in other science labs. It is designed to raise an item to a proper level, not to support a heavy item.
10/05/2006 5:43 PM
787 A Stillman's Pattern lever saw set
10/05/2006 6:10 PM
789. Because the ball is sat on the two ridges:
That is, because the two ridges are off center to the ball, if in theory, the can sit on one ridge which is off center, it would spin the ball as it fell, but because it sits on two, gravity tries to spin it in opposite directions, thus slowing it down.
Also if the ridges were flexible, the ball would 'dig' itself between them!!
I hope you understand, it 'aint easy to explain.
10/06/2006 1:22 AM
789. The gold ball must be made of a softer material than the steel ball bearing, and offer surface resistance to the ramp edges that the steel doesn't.
10/06/2006 10:37 AM
789. If the ball were really a sphere containing another weighted ball in some kind of thick oil, the friction between the weighted ball, which would resist rolling, and the outer sphere, would cause the object to roll very slowly.
10/06/2006 11:23 AM
>786. Letter Scale?
Correct
>788. Watch repair tool - closes watches or sets lens. OR a nutcracker?
Nutcracker is right
>791. Cheese core sampler?
Nope
>786. "O" ring guage?
See above
>791. Incurment Borer.
>791- tree ring borer
Yes
>792 - Lab jack...
>787 A Stillman's Pattern lever saw set
Both correct
>789. Because the ball is sat on the two ridges...
>789. The gold ball must be made of a softer material...
Neither of these.
>789. If the ball were really a sphere containing another weighted ball in some kind of thick oil, the friction between the weighted ball, which would resist rolling, and the outer sphere, would cause the object to roll very slowly.
This is correct, it's a Snail Ball. Please see the answer page for more info.
10/06/2006 1:03 PM
789. Easy! The ramp has two high ridges of hard metal spaced at just slightly less than the diameter of the ball. As the ball rolls, it spins much faster than the actual distance it travels would indicate. It reaches a terminal rotation speed and thus will not travel down the ramp except at a snail's pace even though it is spinning like crazy! Try this where at the bottom of the ramp the ball comes into contact with a surface directly below it. The rotational velocity of the ball will cause it to shoot forward at an unexpected higher speed.
1/24/2011 5:29 PM