Add new comment

"Some more information on this item for you.Starrett had 4 speed indicators that they sold.A) The #102 was sold from the mid-1880's to the early 1890's. This speed indicator was the Woodsman type speed indicator and referenced Woodsman's patent. It is most likely that Starrett purchased the patent from Woodsman and took over manufacture of the indicator.B) The #104 was sold from the early 1890's until 2000.C) The #106 (Improved Speed Indicator) was sold from the early 1890's until 1971.D) The #107 (Registering Speed Indicator) was sold from 1897 until 2000.These speed indicators were made to be used in conjunction with a stopwatch. The machinist would set the counter to zero, put the indicator on the shaft to measure the speed and then pull the indicator off the shaft after a certain period of time (often somewhere between 10 and 30 seconds depending on shaft speed). Calculating the shaft RPM was a simple calculation."