Sodium perborate is a white, granular solid which decomposes in an aqueous solution to hydrogen peroxide and sodium borate. Active oxygen content 10%. Melting point is 63 degrees Celsius. It's used in

 

In decent shape, some old handwriting on the box itself. See pics for detail and feel free to message with questions. FREE SHIP!

 

Traditional Weather Station Barometer Thermometer Hygrometer Gold Coloured Dials WOOD FRAMED WEATHER STATION Polished Gold Coloured Dials & Bezel On A Dark Wood Base. Weather forecast indication.

 

i000000 Vintage Cased 12" Slide Rule 'THE TECHNICAL STANDARD' Click Images to Enlarge You are bidding on a vintage Cased 12" Slide Rule, 'The Technical Standard' in good condition. Photos tell the sto

 

Up for auction is a lot of drafting tools from the estate of an architect. These include everything pictured. Stencils, protractors, triangles, templates, and more. Markers include Dietzgen, Alvin, J.

 

ANTIQUE THOMSON ALTERNTING AMMETER GENERAL ELECTRIC CO. SOLD AS IS - WORKING CONDITION UNKNOWN CAREFULLY READ RULES BEFORE BIDDING AND UPON WINNING TO AVOID DELAYS IN PROCESSING 1)PAYMENT MUST BE MADE

 

WE HAVE MORE PHOTOGRAPHS BELOW ITEM DESCRIPTIONVintage OTIS KINGS model K slide rule calculator, scale 414/423, boxed with instructions. OVERALL CONDITION We would remind bidders that we sell antique

 

Five drafting pens from the early 20th century. The one of the far left may be mid 20th century. The one on the far left and the one second from the right are marked KEUFFEL & ESSER. Second and th

 

Appears to have have been used! Purchased at an estate sale in a plastic bag. The bag is split on the side BUT everything in it seems unused. Fullerton Circular Slide rule 1450. Please see pics for co

 

Sorry no returns, but free shipping inside the US. Used and including brown leather case. Over all well kept and working while listing. Case has some soft areas and discolor. 5.12 inches by 1, lens ar