AN IMPROVED REPLACING FROG. AN IMPROVED BLAST HEATER. SCANLON'S BLAST HEATER. AN IMPROVED SKETCHING TRIPOD OR DELINEATOR. WADE'S SKETCHING TRIPOD. AN ATTACHMENT FOR SCISSORS. NORRELL'S SCISSORS ATTACHMENT. Carbonic Acid in Phthisis. AN IMPROVED SWINGING WINDOW SASH. LADD'S REPLACING FROG. ROEDER'S SWINGING WINDOW SASH., scientific american, 1889-10-12

- Image ID: 2ABX59N

AN IMPROVED REPLACING FROG. AN IMPROVED BLAST HEATER. SCANLON'S BLAST HEATER. AN IMPROVED SKETCHING TRIPOD OR DELINEATOR. WADE'S SKETCHING TRIPOD. AN ATTACHMENT FOR SCISSORS. NORRELL'S SCISSORS ATTACHMENT. Carbonic Acid in Phthisis. AN IMPROVED SWINGING WINDOW SASH. LADD'S REPLACING FROG. ROEDER'S SWINGING WINDOW SASH., scientific american, 1889-10-12

Penta Springs LLP / Alamy Stock Photo

Image ID: 2ABX59N